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Investments (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments | $ (22,824)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ (20,528)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ 41,412 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ 45,699 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ (30,593)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ 21,815 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ (78,726)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ 43,467 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ 43,759 us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ (44,037)us-gaap_FairValueOptionChangesInFairValueGainLoss1 | $ 45,509 us-gaap_FairValueOptionChangesInFairValueGainLoss1
Fixed Maturity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments |  |  |  |  |  |  |  |  | 77,208 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_FixedIncomeSecuritiesMember | (100,703)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_FixedIncomeSecuritiesMember | 36,317 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_FixedIncomeSecuritiesMember
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments |  |  |  |  |  |  |  |  | (32,922)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_EquitySecuritiesMember | 56,822 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_EquitySecuritiesMember | 9,158 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_EquitySecuritiesMember
Short-Term Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments |  |  |  |  |  |  |  |  | $ (527)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | $ (156)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | $ 34 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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